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Old 05-18-2014, 01:45 PM
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Low air flow 02 Grand Cherokee

I replaced the heater core in my wife's Jeep a year ago and ever since I've had low air flow out of the AC vents. I read on this site somewhere that the blower moter could be running backwards, does anyone know how I go about checking it? If a wire is crossed up, is in at the control or on the blower motor?

I have also noticed when I hit the recirculation button I hear the motor speed up but don't see any difference in air flow.
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Old 05-18-2014, 10:54 PM
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Re: Low air flow 02 Grand Cherokee

Welcome to the garage.
Most of the time the connector on the blower motor controller melted away due to a bad contact and a new connector with wires was spliced in. It seems that the colour coding of the wires are not ok, so that the blower motor will rotate in reverse and almost doesn't blow any air. Just swapping two of the wires should address that.
An other possibility is the reciculation door: if the hinges are broken, the door will be laying on top of the blower motor and block most of the airflow. To see this, just remove the blower motor and look up through the hole. Try if you can move the door by hand freely, if it does, the hinges are broken. Some people just hold the door in the up position with some wire, loosing the recirculation function.
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Old 05-20-2014, 07:01 PM
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Re: Low air flow 02 Grand Cherokee

Thanks, at least I know what I'm looking for now
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